The large-scale setup was typical for these events in the Wasatch Mountains with moist, northwesterly flow spillover over a ridge located near the Pacific coast.
This mornings sounding shows very dry conditions at low levels over the Salt Lake Valley, but saturated conditions, indicated by the colocated dewpoint (green) and temperature (red) traces within the cloud layer from about 725 to 650 mb. This is consistent with cloud bases near about 10,000 ft.
In some rime events, larger cloud or drizzle drops can form. That may have been the case last night. The Supreme Chair, for example, was coated in a fairly clear layer of ice that suggests to me some larger drops may have around.
The situation should be better tomorrow. Overnight, as the ridge shifts eastward, the flow weakens and the mid levels dry, as can be seen in the time-height section below.
That should make for a pretty day too.